How common are engine problems in the 2015 Mercedes-Benz C300?

NHTSA lists 133 engine complaints for the 2015 C300, which is 35% of the 381 total complaints filed for that model year — the largest engine complaint share of any C300 model year in this data.

What is the typical mileage when engine problems occur on the 2015 C300?

The median mileage at failure for engine-related complaints on the 2015 C300 is 50,950 miles.

Is there a recall for the 2015 C300 engine issues?

This dataset shows no related recalls listed for the engine problem area, though sample complaints reference NHTSA campaign 17V114000 covering engine and engine cooling.

Did the engine problems cause any crashes or fires?

NHTSA data for this problem area shows 0 crashes, 1 fire, and 0 injuries among the 133 engine complaints.

Are engine complaints worse in 2015 than other C300 years?

Yes. The 2015 C300 has a 35% share of engine complaints, higher than every other model year listed except 2021, which had a 57% share but far fewer total complaints (8).

2015 Mercedes-Benz C300 Engine Problems

NHTSA lists 133 engine complaints for the 2015 Mercedes-Benz C300, 35% of its 381 total complaints for the year — the highest share of any model year listed. Owners commonly report cracked pistons, engine knocking from piston wrist pin tolerances, and sudden loss of acceleration, with a median failure mileage of 50,950. No related recalls are logged in this dataset's related_recalls field, though sample complaints reference NHTSA campaign 17V114000.

Engine complaints: 133; 35% of 381
Crashes reported: 0
Fires reported: 1
Injuries reported: 0
Median mileage: 50,950 mi
Related recalls: 0

Typical engine symptoms owners report

Some owners report a cracked #1 piston while driving 50-60 MPH, accompanied by shaking, smoke, and an illuminated check engine light.
Owners describe loud engine knocking on cold starts, later diagnosed as incorrect piston wrist pin tolerances that can progress to engine failure.
Some drivers report the vehicle failing to accelerate when the pedal is depressed, with no engine response, forcing them to coast to a stop.
Owners with certified pre-owned vehicles report rough, diesel-like idling on cold starts that persisted or worsened even after an engine rebuild tied to a rod and piston recall.
Some complaints describe the vehicle independently decelerating at highway speed with RPM spiking between 4,000 and 5,000 before returning to normal after a restart.
One complaint references NHTSA campaign 17V114000 for engine and engine cooling, noting a long wait for replacement parts.

When 2015 Mercedes-Benz C300 engine complaints were filed

First complaint Apr 24, 2015, latest Aug 6, 2025.

133 complaints filed with NHTSA from 2015 Q2 to 2025 Q3; peak 2023 Q1 (20).

Engine recalls for the 2015 Mercedes-Benz C300

No safety recalls on record for this model year.

Engine complaints by C300 model year

Raw complaint counts per model year; newer years have had less time to accumulate complaints.

201016 (4%)
201114 (3%)
20126 (2%)
201315 (6%)
20145 (5%)
2015133 (35%)
201696 (34%)
201781 (38%)
201835 (35%)
201918 (26%)
20209 (27%)
20218 (57%)
20223 (12%)
20232 (9%)
20242 (18%)
20251 (25%)

Frequently asked questions

How common are engine problems in the 2015 Mercedes-Benz C300?: NHTSA lists 133 engine complaints for the 2015 C300, which is 35% of the 381 total complaints filed for that model year — the largest engine complaint share of any C300 model year in this data.
What is the typical mileage when engine problems occur on the 2015 C300?: The median mileage at failure for engine-related complaints on the 2015 C300 is 50,950 miles.
Is there a recall for the 2015 C300 engine issues?: This dataset shows no related recalls listed for the engine problem area, though sample complaints reference NHTSA campaign 17V114000 covering engine and engine cooling.
Did the engine problems cause any crashes or fires?: NHTSA data for this problem area shows 0 crashes, 1 fire, and 0 injuries among the 133 engine complaints.
Are engine complaints worse in 2015 than other C300 years?: Yes. The 2015 C300 has a 35% share of engine complaints, higher than every other model year listed except 2021, which had a 57% share but far fewer total complaints (8).